Wang Li-Gang, Chen Chang-He, Kolker Kruse H
Department of Thermal Engineering, University of Science and Technology, Beijing 100083, China.
J Environ Sci (China). 2005;17(3):518-20.
The adsorption capacity for vapor-phase elemental mercury (Hg0) of residual carbon separated from fly ash was studied in an attempt for the control of elemental mercury emissions from combustion processes. At low mercury concentrations (< 200 microg/m3), unburned carbon had higher adsorption capacity than commercial activated carbon. The adsorbality of unburned carbon was also found to be source dependent. Isotherms of FS carbon (separated from fly ash of a power plant of Shishi in Fujian Province) were similar to those classified as type II. Isotherms of XJ carbon (separated from fly ash of a power plant of Jingcheng in Shanxi Province) were more like those classified as type II. Due to the relatively low production costs, these residual carbons would likely be considerably more cost-effective for the full-scale removal of mercury from combustion flue gases than other technology.
为了控制燃烧过程中元素汞的排放，对从飞灰中分离出的残余碳对气相元素汞（Hg0）的吸附能力进行了研究。在低汞浓度（<200微克/立方米）下，未燃尽碳的吸附能力高于商业活性炭。还发现未燃尽碳的吸附性取决于来源。FS碳（从福建省石狮市某电厂的飞灰中分离得到）的等温线与分类为II型的等温线相似。XJ碳（从山西省晋城某电厂的飞灰中分离得到）的等温线更类似于分类为II型的等温线。由于生产成本相对较低，与其他技术相比，这些残余碳对于从燃烧烟道气中全面去除汞可能具有更高的成本效益。
